This PowerPoint presentation is the fourth of four in a unit titled, "The Changing Earth", which includes the lessons, "What Are the Earth's Layers?", "How Does the Earth's Crust Move?", "What Changes the Earth's Surface?", and "How Do Rocks Reveal Changes on the Earth?". These are all based upon information from the fifth grade Scott Foresman Science textbook. This particular PowerPoint presentation contains sixteen slides that present students with information about igneous, metamorphic, and sedimentary rock, the rock cycle, Mohs Hardness Scale, and fossils. This PowerPoint presentation, as well as the others in the series, were designed by Marie Wimsett.